# US 2008/0185165 A1 · Hand-held power tool with an oscillation damper

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- Number: US 2008/0185165 A1
- Document ID: US20080185165A1
- Status: Published application
- Kind: A1
- Application number: 12/011,894
- Filed: 2008-01-29
- Published: 2008-08-07
- Earliest claimed: 2007-01-31
- Assignees: Hilti Aktiengesellschaft
- Inventors: Franz Moessnang
- Web page: https://patentgrep.com/patent/US20080185165A1

## CPC

- B25D 17/24: Damping the reaction force {(resiliently mounted handles B25D17/043; dampers in connections of hammers to backhoes E02F3/966)}
- B25D 17/06: Hammer pistons; Anvils {; Guide-sleeves for pistons}
- B25D 2211/068: Crank-actuated impulse-driving mechanisms
- B25D 2217/0019: Guide-sleeves
- B25D 2217/0092: being spring-mounted
- B25D: PERCUSSIVE TOOLS {(percussive machines for forging B21J; hand-held drilling machines, in general B23B45/00, for wood B27C3/08; drilling machines, used for mining or quarrying, with reciprocating tool which is turned intermittently when out of contact with the working face E21B1/00)}

## Abstract

A hand-held power tool includes a pneumatic percussing mechanism (3) located in the power tool housing (2) and having an anvil (5) and a percussion piston (4) for applying blows to the anvil (5), and at least one oscillation damper (6, 6′) including an oscillation damping mass (7, 7′), at least one spring (8a, 8a′) for compressively preloading the damping mass (7, 7′) against the power tool housing (2), and an axially displaceable excitation member (9) for actively exciting the oscillation damper (6, 6′) in response to the anvil (5) occupying an operational position.

## Claims

### Claim 1

A hand-held power tool, comprising a housing (2); a pneumatic percussion mechanism (3) located in the housing (2) and including an anvil (5) and a percussion piston (4) for applying blows to the anvil (5); and at least one oscillation damper (6, 6′) including an oscillation damping mass (7, 7′), at least one spring (8a, 8a′) for compressively preloading the damping mass (7, 7′) against the power tool housing (2), and an axially displaceable excitation member (9) for actively exciting the oscillation damper (6, 6′) in response to the anvil (5) occupying an operational position thereof.

### Claim 2 (depends on 1)

A hand-held power tool according to claim 1, wherein the excitation member (9) at least partially circumferentially engages a guide tube (11) for the anvil (5).

### Claim 3 (depends on 1)

A hand-held power tool according to claim 1, wherein the excitation member (9) is formed as a ring-shaped member.

### Claim 4 (depends on 1)

A hand-held power tool according to claim 1, wherein the oscillation damper (6′) is formed as a hollow cylindrical element.

### Claim 5 (depends on 1)

A hand-held power tool according to claim 1, wherein the at least one oscillation damper (6, 6′) is arranged sideways of the pneumatic percussion mechanism (3).